American Powertrain Announces New Pro-Fit 5 & 6-Speed System for 1978 – 1987 GM G-Body

If you’ve ever wanted to swap a 5- or 6-speed into your G-body, it’s now easier and more possible than every thanks to American Powertrain‘s new Pro-Fit System for ’78-88 GM G-body vehicles. it comes complete with everything you need, as well as providing the option for you to customize the kit to suit your needs.

Official Release:

American Powertrain Announces New Pro-Fit 5 & 6-Speed System for 1978 – 1987 GM G-Body Vehicles
— System includes TREMEC transmission with choice of gear ratios

Cookeville, TN (August 27, 2019) – American Powertrain, the world’s largest TREMEC dealer, is now introducing the next generation Pro-Fit 5-speed & 6-speed system for 1978-1988 GM G Body.

Designed around the famous TREMEC TKO 5-speed and the dual overdrive Magnum 6-speed transmissions, the Pro-Fit kits features a custom adjustable cross member, custom high strength driveshaft, trans mount, offset shifter and speedo solution. G-body hydraulic clutch kit is also available to complete the conversion to three pedals.

American Powertrain has all the parts and pieces of the Pro-Fit kits available separate so you can build out your kit to fit the needs of the project. A full assortment of bell housings, clutches, flywheels and drive line parts are available from American Powertrain.

All Pro-Fit kits are covered by American Powertrain’s two year warranty and includes extended hours tech support.

For more information visit To speak with one of American Powertrain’s highly qualified sales technicians, call 931-646-4836.


  • Makes swapping a 5- or 6-speed into your G-body easier
  • Kit is avail in piece, so you can customize your own to suit your needs
  • Includes 2-year warranty
  • You will no longer get ridiculed for having only two pedals

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